Am Donnerstag, 27. Juni 2002 18:20 schrieb David Brownell:
> Oliver Neukum wrote:
> >>after looking around in source codes and searching in mailing list and
> >>G*gle, I still couldn't find any hints why there exists only one
> >> "khubd" in USB Stack.
> >
> > Hotpluggings are rare events ... Besides they take BKL and thus
> > couldn't run in concurrency.
>
> What was the reason they have BKL? In principle it shouldn't
> be needed, since all the relevant USB data structures are locked
> correctly, and there's no comment in the code explaining why
> the hub driver touches the BKL ...
Module unloading.
This code from usb_find_interface_driver() would race else:
for (tmp = usb_driver_list.next; tmp != &usb_driver_list;) {
driver = list_entry(tmp, struct usb_driver, driver_list);
tmp = tmp->next;
if (driver->owner)
__MOD_INC_USE_COUNT(driver->owner);
Regards
Oliver
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